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Petsmart or Petco have colored gravels, including black.
Paul
Paul
Posts by Paul Higashikawa
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Joined
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2,191 Posts
I have had mine, some of which were from those stores, for more than 5 years. Haven't seen any discoloration in any tank. I guess results could vary along with everyone's own water chemistry and other chemicals present in the tank. (also speak with experience)
Paul
Paul
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